TfL say the noise levels are within Health and Safety Executive regulations but residents living above tube lines have said they have recorded a noise of 52 decibels – far louder than the World Health Organisation (WHO) guidelines.

The transport authority has installed technology in an attempt to reduce the noise above ground, which has a knock-on effect of causing a screeching noise in the tunnels on the Northern line. New pads have been installed alongside the technology – called Pandrol Vanguard – on parts of the Victoria line, which can also help reduce noise underground.

However, on the noise from Euston to Tufnell Park, while some remedial action has been ­taken, a TfL spokesman said: “For this stretch there isn’t currently a solution but we’re working on alternatives and we have a fund of around £1million per year to work on new technology to find solutions.”

The spokesman could not provide a “concrete answer” on how long it will take.

On the noise in homes, Peter McNaught, London Underground’s Director of Asset Operations, said: “We are committed to doing all we can to minimise noise levels and to being good neighbours.

“We understand the effect that noise from the tube can have on residents living nearby, and have undertaken extensive work across the ­network to reduce noise and vibrations.”

He added: “We have completed several different remedial actions around Camden to try and reduce noise levels, and will continue to monitor these levels and to liaise with residents about this issue.

“I encourage anyone affected to speak to our dedicated customer services team so that we can continue to improve this issue.”